Which requires the least total storage to run Windows 7, configuring an MBA for dual-boot with Bootcamp, or using a VM (Parallels, VMWare, VirtualBox)?
For the smallest solution, how many free GB would be required for a standard minimal system Windows 7 install? (such as just for testing web pages on MSIE, and such.)
Can a VM boot and run Windows off of a USB connected HD or SSD well enough to be "usable"?